10 Style Mistakes That Make You Look Bigger Than You Are (and How to Fix Them)
The most repeated rule in this genre is wrong.
Horizontal stripes do not make you look wider. In several studies they made people look narrower.
The things that actually add visual size are less famous and much easier to fix.
Most of them come down to where a line lands and how much the fabric is doing on its own. A bra band that rides up at the back changes the shape of every top over it, and a hem that stops at the widest point puts a marker right there. None of this is about shrinking. It is about clothes that sit on your body instead of beside it. If your midsection is the part you are dressing around, our tummy-friendly outfit ideas go deeper, and the body shape calculator helps you see where your widest and narrowest points sit.
First, the stripes
In 2011, Peter Thompson and Kyriaki Mikellidou at the University of York tested the old rule and found the opposite. A square covered in horizontal stripes looked taller and narrower than the same square in vertical stripes, an effect first described by Hermann von Helmholtz in the 1860s. A 2021 study in Perception repeated it with photos of a real model: horizontal stripes looked thinner, yet 58 percent of the people in the study believed the reverse.
There is a caveat, and we would rather give it than skip it. A 2013 study found the narrowing effect weaker on larger figures and varied a lot between viewers, and an analysis of about 1,000 real photos found no clear effect at all. So stripes are neutral at worst. A fine Breton stripe is fine. A wide, high-contrast band placed right across the hip is a different case, and it shows up below under mistake seven.
Fit mistakes (1 to 4)
1. A bra band that rides up at the back
This is first because it changes everything over it. When the band is loose, it rides up at the back and the bust drops, which closes the space between bust and waist. With that space gone, a top falls straight from the bust and the whole torso reads shorter and wider. Cups that are too small add a ridge across the top of the bust, which shows through a knit.
It is common. In a 2010 study of 104 women, 85 percent of the bras they already owned failed basic fit checks. The band should sit level and feel firm on the loosest hook, so you can tighten it as it stretches. The center panel should lie flat on your breastbone. Our bra size calculator and fitting checks walk through each one, and sizes vary between brands enough that a re-fit is worth it every year or two.
2. Clothes bought a size up for room
Extra fabric makes its own outline, and that outline is wider than you. The shoulder seam drops down your arm, fabric pools under the arms, and a shirt that fits at the bust stands away from your body below it. Buy for your largest measurement, usually the bust or hip, then have the rest taken in. The shoulder seam should sit at the edge of the shoulder bone. Most tailors can take in a waist or shorten sleeves cheaply, but shoulders are expensive to alter and often cannot be. Our size chart guide shows how to take the three measurements that matter.
3. Clothes so tight they pull
Tension shows up as creases running sideways: across the bust between buttons, across the hips on trousers, at a waistband that digs in. Each crease is a horizontal line, and they gather exactly where the fabric is most stretched. The test is simple. Sit down, raise your arms, and look in a mirror. If a button gapes or a seam pulls, size up and have the waist taken in.
4. Volume on top and bottom at the same time
A boxy top over wide-leg trousers is a good outfit on a runway model and a hard one for most other bodies, because there is no visible waist anywhere. The silhouette becomes one rectangle. Keep one half closer to the body. Wide trousers go with a fitted knit or a front tuck. A boxy shirt goes with a straight or slim leg. The apple shape outfits use this rule on almost every look.
Where the lines land (5 to 7)
Every edge of a garment is a line, and the eye goes to where it ends.
5. A hem that stops at the widest point
A skirt that ends at the fullest part of the calf, a top that ends at the fullest part of the hip, a cap sleeve that stops at the widest part of the upper arm. In each case the hem draws a line across you at exactly that spot. Move it up or down an inch or two. Skirts work best just below the knee or lower down where the calf narrows. Tops and jackets work best above the hip bone or past the fullest part of the hip. Sleeves look best ending at the narrowest part of the forearm or just past the fullest part of the upper arm. Our midi skirt outfits show how much two inches of hem changes.
6. A rise that sits in the wrong place
Low-rise trousers put the waistband across the softest part of the stomach, where it presses in and makes a ridge. A back rise that is too short pulls the waistband down when you sit, so it gaps at the back and digs at the front. Look for a waistband at or just below your natural waist, the narrowest part of the torso, and sit down in the fitting room before you buy. Curvy cuts with a contoured back waistband fix the gap at the back for many bodies.
7. A hard horizontal break at the fullest part
A contrasting belt worn on the hips, a top and trousers that meet in two strongly different colors right at the widest point, a wide stripe across the hip. Each one puts a dark line across the part you least want the eye to stop on. Move the break to the narrowest part of your waist, or remove it. Tonal dressing, a top and bottom in the same or similar color, keeps the line running. A jacket or long cardigan worn open adds two vertical edges down the front. Our styling tips for women under 5'4" use the same idea for height.
Fabric mistakes (8 to 10)
8. Thin jersey that clings
Lightweight jersey has no weight of its own, so it follows every contour, including the bra band, the seams of your underwear, and every fold where you sit. It outlines rather than drapes. Hold the fabric up to a window in the shop. If you can see light through it, it will cling. Swap to a heavier knit such as ponte or double knit, or a lined dress. This is the mistake we see most often in summer, when people reach for the thinnest fabric for the heat. Linen or a lyocell blend breathes without clinging.
9. High shine over large areas
Glossy satin, metallic knits, and wet-look leggings reflect light directly. The highlights land on the curves that face forward and the shadows land in the dips, which makes every curve look deeper. Use shine in small doses, a satin cami under a blazer or a metallic shoe, and choose matte fabrics like crepe, matte satin, or brushed cotton for anything large.
10. Bulky texture with no structure
A chunky cable knit, a fleece, or a puffer adds real centimeters of thickness, and its shape comes from the fabric, not from you. That is fine on purpose, and we would not give up a chunky sweater in January. The fix is to give it an edge. Wear a chunky cardigan open over a fine knit so the front shows a vertical opening, choose a finer-gauge knit for tops you wear tucked, or pick a puffer with a cinched waist. Our fall outfits show chunky knits worn this way.
What about wearing black?
Black does make you look slightly smaller. Two studies found the effect is real, small, and stronger against a dark background. It is much smaller than the effect of fit or hem placement, though, so a well-fitting cobalt dress does more than a black one that pulls across the hips. Wear black if you like it. Our black jeans outfits show it at its best. Do not wear it as a substitute for the fixes above.
If the outfit still looks off after all ten, the problem is often age-dating rather than size, which we cover in the 13 mistakes that read older. Small finishing details like pilling and loose threads are in our list of tiny things that look cheap. For a full bust in particular, see the best and worst clothes for a big bust.
Frequently Asked Questions
What clothes make you look bigger than you are?
Clothes sized too big, clothes so tight they pull into horizontal creases, volume on both your top and bottom half at once, hems that end at the widest part of the calf or hip, thin clingy jersey, high-shine fabric over large areas, and bulky chunky knits with no structure. A bra band that rides up at the back changes the fit of every top over it, so it belongs on the list too.
Do horizontal stripes make you look fatter?
Mostly no. Studies from the University of York and later research using photos of a real model found horizontal stripes made the wearer look slightly narrower, a version of the Helmholtz illusion. A large study of about 1,000 real photos found no clear effect either way. One study found the narrowing effect weaker on larger bodies, so stripes are neutral at worst. Wide, high-contrast bands behave differently from fine stripes.
Does wearing black make you look smaller?
Slightly. Two studies found dark clothing made people look a little thinner, with a stronger effect against a dark background. The effect is small compared with fit, hem placement, and fabric weight, so an ill-fitting black dress will still read bigger than a well-fitting colored one.
Should I size up so clothes are not tight?
Size up only as far as your largest measurement needs, then have the rest altered. A size or two bigger for room puts the shoulder seam down your arm and adds a layer of fabric that sits away from your body, which reads wider than the body underneath. A tailor can take in a waist or shorten a sleeve cheaply. A shoulder is hard to fix.
How do I know if my bra fits?
The band should sit level all the way around and feel firm on the loosest hook. The center panel between the cups should lie flat against your breastbone, the cups should be smooth at the top edge with no ridge, and the straps should not dig in or carry the weight. If the band rides up at the back, it is too loose.
